Skip to content
CNMS ICSE - 7 Std
Share
Explore

Answers to textbook exercises

Prepared by: learnloophq@gmail.com

Chapter: 02. Kingdom Classification

⁠

Check Point 1

Write True or False.
Bacteria are multicellular organisms which lack chlorophyll.
False (Bacteria are microscopic, unicellular/single-celled organisms).
Some bacteria are helpful in increasing soil fertility.
True
Bacteria are eukaryotic organisms.
False (Bacteria are prokaryotic organisms).
Anthrax of sheep is caused by bacteria.
True
Clostridium bacteria are used in the manufacture of butyl alcohol.
True
⁠

Check Point 2

Fill in the blanks.
Bacteria are prokaryotic organisms.
prokaryotic
Volvox is a colonial alga.
colonial
Yeast and bread mould are fungi.
fungi
Mosses belong to the group Bryophyta.
Bryophyta
Bryophytes are called amphibians of plant kingdom.
Bryophytes (or Mosses)
The leaves of fern bear sori on their undersurface.
sori
⁠

Check Point 3

Write True or False.
Gymnosperms bear flowers.
False (Gymnosperms do not bear flowers; they bear cones).
In angiosperms, seeds develop in the ovary.
True
Dicotyledonous seeds bear two seed leaves.
True
⁠

Test Yourself

A. Multiple Choice Questions
All organisms belonging to fungi are (a) autotrophic (b) parasitic © saprophytic (d) either saprophytic or parasitic
(d) either saprophytic or parasitic
Well-developed roots, stem and leaves are present in (a) bryophytes and algae (b) algae, bryophytes and gymnosperms © algae, bryophytes and angiosperm (d) ferns, gymnosperms and angiosperms
(d) ferns, gymnosperms and angiosperms
An example of a nonflowering plant is (a) fern (b) Pinus © mango (d) lotus
(a) fern
Aquatic nonflowering plants are (a) algae (b) bryophytes © fungi (d) pteridophytes
(a) algae
Cycas belongs to (a) dicotyledons (b) monocotyledons © angiosperms (d) gymnosperms
(d) gymnosperms
Which of the following is a monocot plant? (a) mango (b) china rose © rose (d) wheat
(d) wheat
Maize is (a) a gymnosperm (b) an angiosperm © a fern (d) a bryophyte
(b) an angiosperm
Bryophytes are found in (a) moist places (b) dry places © sea (d) pond
(a) moist places
⁠
B. Assertion-Reason Type Questions
Assertion [A]: Fungi are decomposers and play a vital role in nutrient cycles. ​Reason [R]: They feed on dead and decaying organic matter. (a) Both Assertion [A] and Reason [R] are true. (b) Both Assertion [A] and Reason [R] are false. © Assertion [A] is true but Reason [R] is false. (d) Assertion [A] is false but Reason [R] is true.
(a) Both Assertion [A] and Reason [R] are true.
Assertion [A]: Bacteria are multicellular organisms with a single nucleus. ​Reason [R]: Each bacterial cell is able to carry out all the life processes. (a) Both Assertion [A] and Reason [R] are true. (b) Both Assertion [A] and Reason [R] are false. © Assertion [A] is true but Reason [R] is false. (d) Assertion [A] is false but Reason [R] is true.
(d) Assertion [A] is false but Reason [R] is true. (Bacteria are unicellular prokaryotes with no defined nucleus).
⁠
C. Fill in the blanks with suitable words.
Trees with long needle-shaped leaves are found in cold and mountainous areas.
cold and mountainous areas
In ferns, the leaves bear sori on the undersurface for bearing spores.
sori
Umbrella-shaped mushroom usually grows on decaying wood or garbage.
mushroom
Bryophytes are green plants that have rhizoids in place of roots.
Bryophytes (or Mosses)
In gymnosperms seeds are not enclosed in a fruit.
gymnosperms
⁠
D. State whether these statements are true or false. If false, rewrite the correct form of statements.
Blackish cottony growth on stale bread is called bread mould.
True
All pulses are monocot plants.
False. Correct Form: All pulses (such as gram, pea, and bean) are dicot plants.
Algae are most primitive thallophytes.
True
Bryophytes have needle-like leaves.
False. Correct Form: Gymnosperms have needle-like leaves.
Ferns and mosses produce spores.
True
⁠
E. Give one word for the following.
Algae, fungi and bacteria
Thallophyta (or Thallophytes)
Plants that grow on dead remains of other plants and animals
Saprophytes (or Saprotrophs)
Flowering plants that have two cotyledons
Dicotyledons (or Dicots)
The underground stem of pteridophytes
Rhizome
Plants which do not have root, stem and leaves
Thallophytes (or Thalloid plants)
⁠
F. Differentiate between the following.
Nonflowering plants and flowering plants
Differences:
Nonflowering plants (Cryptogams): Do not bear flowers, seeds, or fruits. They reproduce primarily by producing spores (e.g., Algae, Mosses, Ferns).
Flowering plants (Phanerogams): Bear flowers and produce fruits and seeds (or naked seeds in cones) (e.g., Gymnosperms, Angiosperms).
Parasitic plants and saprotrophic plants
Differences:
Parasitic plants/fungi: Derive nutrition by growing on and feeding from other living organisms (hosts).
Saprotrophic plants/fungi: Derive nutrition by feeding on dead and decaying organic matter.
Gymnosperms and angiosperms
Differences:
Gymnosperms: Seeds are naked and develop inside cones; they do not produce true flowers or fruits (e.g., Pine, Cycas).
Angiosperms: Highly evolved plants that produce true flowers and fruits; their seeds are enclosed inside a fruit wall (e.g., Mango, Pea).
Monocot plants and dicot plants
Differences:
Monocot plants: Seed contains only one cotyledon (seed leaf) (e.g., Wheat, Maize, Rice).
Dicot plants: Seed contains two cotyledons (seed leaves) (e.g., Gram, Pea, Bean).
⁠
G. Match the columns.
Column A
Column B
1. Leaves with sori
(a) A saprophyte
2. Plants with seeds but no fruits
(b) Bacteria
3. Group of organisms with acellular body
© Bryophytes
4. Bread mould
(d) Gymnosperms
5. Plant with rhizoids
(e) Pteridophytes
⁠
Correct Matching:
1. Leaves with sori — (e) Pteridophytes
2. Plants with seeds but no fruits — (d) Gymnosperms
3. Group of organisms with acellular body — (b) Bacteria
4. Bread mould — (a) A saprophyte
5. Plant with rhizoids — © Bryophytes
⁠
H. Answer these questions.
Why was the need for classification of living organisms felt?
The need was felt because of the incredibly vast number of living things (over 12 lakh types of animals and 3 lakh types of plants). Classification groups organisms systematically on the basis of their similarities, making their identification, naming, and comparative study much easier.
Name the two groups of living organisms.
Under the traditional Two-Kingdom System of classification proposed by Linnaeus, the two groups are Kingdom Plantae (plants) and Kingdom Animalia (animals).
Into how many groups are nonflowering plants divided? Give examples also.
Nonflowering plants (Cryptogams) are divided into three groups:
Thallophyta: e.g., Algae (Spirogyra, Chlamydomonas)
Bryophyta: e.g., Mosses, Liverworts
Pteridophyta: e.g., Ferns (Dryopteris, Equisetum)
Name two edible fungi. Why are fungi preferred as food?
Two edible fungi are Morchella and Agaricus (mushrooms). They are preferred as food because they are highly rich in proteins and vitamins.
Name any two diseases caused by bacteria.
Two bacterial diseases are Typhoid and Cholera (or tuberculosis, pneumonia).
Write a note on the economic importance of bacteria.
Bacteria are economically crucial across multiple fields:
In Medicine: They produce life-saving antibiotics (such as streptomycin and erythromycin), vaccines, and serums to cure and prevent diseases.
In Industry: They are used in the preparation of curd (Lactobacillus), cheese curing, vinegar production, leather tanning, and the retting of jute fibres.
In Agriculture: Nitrogen-fixing bacteria like Rhizobium (found in leguminous root nodules) convert atmospheric nitrogen into nitrates, boosting soil fertility.
In Environment: They act as decomposers, clearing dead organic waste and helping in biogas generation.
What are gymnosperms? List their characteristic features.
Gymnosperms are primitive, seed-bearing plants whose seeds are naked and not enclosed within a fruit.
Characteristic Features:
Gallery
 
Want to print your doc?
This is not the way.
Try clicking the ··· in the right corner or using a keyboard shortcut (
CtrlP
) instead.